Nanny taught me the command at 30 levels of cr.me.tr.in (and a bonus of 133). After having broken my leg my dex penalty was only -3, not -5. This could be down to me not moving at all afterwards, I believe the penalty increases with movement only.
Frazyl wrote: "With 190 crafts.medicine.treatment.injury bonus it worked on the 6th attempt". With a bonus of 182 I couldn't make it work, Glowen splinted me without problems at a bonus of 202. --Gunde 11:46, 5 July 2011 (UTC)
With 205 bonus I still fail around 50% of times. Two broken legs give me a dex penalty of -6. --Gunde 15:50, 5 July 2011 (UTC)
Well 190 was for -5 dex that I got from the broken legs page but I hadn't thought to check until after splinting. At -3 dex I would have had 195 bonus. I'm not sure why the broken legs page reported it as -5, maybe the way you break your legs changes the penalty. --Frazyl 07:55, 6 July 2011 (UTC)
Managed it on the third attempt with 209 bonus.